Knock Sensor

The Knock Sensor (KS) detects abnormal knocking in the engine. The sensor is mounted in the engine block near the cylinders. The sensor produces an AC output voltage which increases with the severity of the knock. This signal is sent to the Engine Control Module (ECM). The ECM then adjusts the ignition timing to reduce the spark knock.

Testing

Specific to:

Suzuki Forenza 2007-2008

Suzuki Reno 2007-2008

NOTE

If the engine has an internal knock or audible noise that causes a knocking type noise on the engine block, the Knock Sensor (KS) may be responding to the noise.

NOTE

The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

The KS produces an AC signal so that under a no-knock condition the signal on the KS circuit measures about 0.007 Volts AC. The KS signal's amplitude and frequency depend upon the amount of knock being experienced.

Conditions for Setting the DTC.

Vacuum is less than the predetermined value (10-50 kPa, based on RPM).